When Vonage discontinued its free calling feature to Canada/US from its mobile app, I was just worried because we don't have any reliable app to make free calls across Canada/US. Thanks to Google for releasing an updated Google hangouts for iOS which features free calling across Canada & USA. Though there is no official Google voice app here in Canada, the latest hangouts app changes the situation and it's a good start.

Users who retained their Google voice/Grand central number will make and receive calls from that number while new users in Canada will have their calls show up as 'Unknown'.